1*0Sstevel@tonic-gate /* crypto/des/cfb_enc.c */ 2*0Sstevel@tonic-gate /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3*0Sstevel@tonic-gate * All rights reserved. 4*0Sstevel@tonic-gate * 5*0Sstevel@tonic-gate * This package is an SSL implementation written 6*0Sstevel@tonic-gate * by Eric Young (eay@cryptsoft.com). 7*0Sstevel@tonic-gate * The implementation was written so as to conform with Netscapes SSL. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * This library is free for commercial and non-commercial use as long as 10*0Sstevel@tonic-gate * the following conditions are aheared to. The following conditions 11*0Sstevel@tonic-gate * apply to all code found in this distribution, be it the RC4, RSA, 12*0Sstevel@tonic-gate * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13*0Sstevel@tonic-gate * included with this distribution is covered by the same copyright terms 14*0Sstevel@tonic-gate * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15*0Sstevel@tonic-gate * 16*0Sstevel@tonic-gate * Copyright remains Eric Young's, and as such any Copyright notices in 17*0Sstevel@tonic-gate * the code are not to be removed. 18*0Sstevel@tonic-gate * If this package is used in a product, Eric Young should be given attribution 19*0Sstevel@tonic-gate * as the author of the parts of the library used. 20*0Sstevel@tonic-gate * This can be in the form of a textual message at program startup or 21*0Sstevel@tonic-gate * in documentation (online or textual) provided with the package. 22*0Sstevel@tonic-gate * 23*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 24*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 25*0Sstevel@tonic-gate * are met: 26*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the copyright 27*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 28*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 29*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 30*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 31*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software 32*0Sstevel@tonic-gate * must display the following acknowledgement: 33*0Sstevel@tonic-gate * "This product includes cryptographic software written by 34*0Sstevel@tonic-gate * Eric Young (eay@cryptsoft.com)" 35*0Sstevel@tonic-gate * The word 'cryptographic' can be left out if the rouines from the library 36*0Sstevel@tonic-gate * being used are not cryptographic related :-). 37*0Sstevel@tonic-gate * 4. If you include any Windows specific code (or a derivative thereof) from 38*0Sstevel@tonic-gate * the apps directory (application code) you must include an acknowledgement: 39*0Sstevel@tonic-gate * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40*0Sstevel@tonic-gate * 41*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42*0Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44*0Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45*0Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46*0Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47*0Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49*0Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50*0Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51*0Sstevel@tonic-gate * SUCH DAMAGE. 52*0Sstevel@tonic-gate * 53*0Sstevel@tonic-gate * The licence and distribution terms for any publically available version or 54*0Sstevel@tonic-gate * derivative of this code cannot be changed. i.e. this code cannot simply be 55*0Sstevel@tonic-gate * copied and put under another distribution licence 56*0Sstevel@tonic-gate * [including the GNU Public Licence.] 57*0Sstevel@tonic-gate */ 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate #include "e_os.h" 60*0Sstevel@tonic-gate #include "des_locl.h" 61*0Sstevel@tonic-gate 62*0Sstevel@tonic-gate /* The input and output are loaded in multiples of 8 bits. 63*0Sstevel@tonic-gate * What this means is that if you hame numbits=12 and length=2 64*0Sstevel@tonic-gate * the first 12 bits will be retrieved from the first byte and half 65*0Sstevel@tonic-gate * the second. The second 12 bits will come from the 3rd and half the 4th 66*0Sstevel@tonic-gate * byte. 67*0Sstevel@tonic-gate */ 68*0Sstevel@tonic-gate /* Until Aug 1 2003 this function did not correctly implement CFB-r, so it 69*0Sstevel@tonic-gate * will not be compatible with any encryption prior to that date. Ben. */ 70*0Sstevel@tonic-gate void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits, 71*0Sstevel@tonic-gate long length, DES_key_schedule *schedule, DES_cblock *ivec, 72*0Sstevel@tonic-gate int enc) 73*0Sstevel@tonic-gate { 74*0Sstevel@tonic-gate register DES_LONG d0,d1,v0,v1; 75*0Sstevel@tonic-gate register unsigned long l=length,n=(numbits+7)/8; 76*0Sstevel@tonic-gate register int num=numbits,i; 77*0Sstevel@tonic-gate DES_LONG ti[2]; 78*0Sstevel@tonic-gate unsigned char *iv; 79*0Sstevel@tonic-gate unsigned char ovec[16]; 80*0Sstevel@tonic-gate 81*0Sstevel@tonic-gate if (num > 64) return; 82*0Sstevel@tonic-gate iv = &(*ivec)[0]; 83*0Sstevel@tonic-gate c2l(iv,v0); 84*0Sstevel@tonic-gate c2l(iv,v1); 85*0Sstevel@tonic-gate if (enc) 86*0Sstevel@tonic-gate { 87*0Sstevel@tonic-gate while (l >= n) 88*0Sstevel@tonic-gate { 89*0Sstevel@tonic-gate l-=n; 90*0Sstevel@tonic-gate ti[0]=v0; 91*0Sstevel@tonic-gate ti[1]=v1; 92*0Sstevel@tonic-gate DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT); 93*0Sstevel@tonic-gate c2ln(in,d0,d1,n); 94*0Sstevel@tonic-gate in+=n; 95*0Sstevel@tonic-gate d0^=ti[0]; 96*0Sstevel@tonic-gate d1^=ti[1]; 97*0Sstevel@tonic-gate l2cn(d0,d1,out,n); 98*0Sstevel@tonic-gate out+=n; 99*0Sstevel@tonic-gate /* 30-08-94 - eay - changed because l>>32 and 100*0Sstevel@tonic-gate * l<<32 are bad under gcc :-( */ 101*0Sstevel@tonic-gate if (num == 32) 102*0Sstevel@tonic-gate { v0=v1; v1=d0; } 103*0Sstevel@tonic-gate else if (num == 64) 104*0Sstevel@tonic-gate { v0=d0; v1=d1; } 105*0Sstevel@tonic-gate else 106*0Sstevel@tonic-gate { 107*0Sstevel@tonic-gate iv=&ovec[0]; 108*0Sstevel@tonic-gate l2c(v0,iv); 109*0Sstevel@tonic-gate l2c(v1,iv); 110*0Sstevel@tonic-gate l2c(d0,iv); 111*0Sstevel@tonic-gate l2c(d1,iv); 112*0Sstevel@tonic-gate /* shift ovec left most of the bits... */ 113*0Sstevel@tonic-gate memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); 114*0Sstevel@tonic-gate /* now the remaining bits */ 115*0Sstevel@tonic-gate if(num%8 != 0) 116*0Sstevel@tonic-gate for(i=0 ; i < 8 ; ++i) 117*0Sstevel@tonic-gate { 118*0Sstevel@tonic-gate ovec[i]<<=num%8; 119*0Sstevel@tonic-gate ovec[i]|=ovec[i+1]>>(8-num%8); 120*0Sstevel@tonic-gate } 121*0Sstevel@tonic-gate iv=&ovec[0]; 122*0Sstevel@tonic-gate c2l(iv,v0); 123*0Sstevel@tonic-gate c2l(iv,v1); 124*0Sstevel@tonic-gate } 125*0Sstevel@tonic-gate } 126*0Sstevel@tonic-gate } 127*0Sstevel@tonic-gate else 128*0Sstevel@tonic-gate { 129*0Sstevel@tonic-gate while (l >= n) 130*0Sstevel@tonic-gate { 131*0Sstevel@tonic-gate l-=n; 132*0Sstevel@tonic-gate ti[0]=v0; 133*0Sstevel@tonic-gate ti[1]=v1; 134*0Sstevel@tonic-gate DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT); 135*0Sstevel@tonic-gate c2ln(in,d0,d1,n); 136*0Sstevel@tonic-gate in+=n; 137*0Sstevel@tonic-gate /* 30-08-94 - eay - changed because l>>32 and 138*0Sstevel@tonic-gate * l<<32 are bad under gcc :-( */ 139*0Sstevel@tonic-gate if (num == 32) 140*0Sstevel@tonic-gate { v0=v1; v1=d0; } 141*0Sstevel@tonic-gate else if (num == 64) 142*0Sstevel@tonic-gate { v0=d0; v1=d1; } 143*0Sstevel@tonic-gate else 144*0Sstevel@tonic-gate { 145*0Sstevel@tonic-gate iv=&ovec[0]; 146*0Sstevel@tonic-gate l2c(v0,iv); 147*0Sstevel@tonic-gate l2c(v1,iv); 148*0Sstevel@tonic-gate l2c(d0,iv); 149*0Sstevel@tonic-gate l2c(d1,iv); 150*0Sstevel@tonic-gate /* shift ovec left most of the bits... */ 151*0Sstevel@tonic-gate memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); 152*0Sstevel@tonic-gate /* now the remaining bits */ 153*0Sstevel@tonic-gate if(num%8 != 0) 154*0Sstevel@tonic-gate for(i=0 ; i < 8 ; ++i) 155*0Sstevel@tonic-gate { 156*0Sstevel@tonic-gate ovec[i]<<=num%8; 157*0Sstevel@tonic-gate ovec[i]|=ovec[i+1]>>(8-num%8); 158*0Sstevel@tonic-gate } 159*0Sstevel@tonic-gate iv=&ovec[0]; 160*0Sstevel@tonic-gate c2l(iv,v0); 161*0Sstevel@tonic-gate c2l(iv,v1); 162*0Sstevel@tonic-gate } 163*0Sstevel@tonic-gate d0^=ti[0]; 164*0Sstevel@tonic-gate d1^=ti[1]; 165*0Sstevel@tonic-gate l2cn(d0,d1,out,n); 166*0Sstevel@tonic-gate out+=n; 167*0Sstevel@tonic-gate } 168*0Sstevel@tonic-gate } 169*0Sstevel@tonic-gate iv = &(*ivec)[0]; 170*0Sstevel@tonic-gate l2c(v0,iv); 171*0Sstevel@tonic-gate l2c(v1,iv); 172*0Sstevel@tonic-gate v0=v1=d0=d1=ti[0]=ti[1]=0; 173*0Sstevel@tonic-gate } 174*0Sstevel@tonic-gate 175